Key-guard.



Patented Mar. I9, I90l.

L. MULLAUERv KEY GUARD.

(Application filed Jan. 14, 1901.

(No Model.)

Unrrn Sans LEOPOLD LWIULLAUER, OF CHICAGO, ILLINOIS.

KEY-GUARD.

SPECIFICATION forming partof Letters Patent No. 670,240, dated March 19,1901.

Application filed January 14, 1901. erial No. 43,273. (No model.)

To (LZZ whom it may concern.-

Be it known that I, LEOPOLD MULLAUER, a citizen of the United States,residing at Ohicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Key-Guards, of which thefollowing is a specification.

This invention relates to improvements in a guard or fastener for keys;and it consists in certain peculiarities of the construction, novelarrangement, and operation of the parts thereof, as will be hereinaftermore fully set forth and specifically claimed.

One object of myinvention is to provide a guard or fastener fordoor-keys which shall be simple in construction, compact in form, strongand durable, and which may be readily placed in position with respect tothe key, so as to prevent the latter being turned or removed from thelook by means of instruments in the hands of a burglar or other person.

Another object is to so construct the guard that it will be adjustableto keys having stems or shanks of different lengths.

Still another object of the invention is to so form the main bar of theguard that it will be securely located in the keyhole and in such amanner as to prevent an instrument being passed to either side thereof,thus preventing any one tampering with the fastening mechanism.

In order to enable others skilled in the art to which my inventionpertains to make and use the same, I will now proceed to describe it,referring to the accompanying drawings, in which- Figure l is aperspective view of a portion of a door, showing a key and my guard orfastener in position in the lock thereof. Fig. 2 is a view in sideelevation of the guard. Fig. 3 is a plan view of the same, and Fig. 4 isan end view with the adjusting-rod removed.

Similar letters refer to like parts throughout the different views ofthe drawings.

A represents a portion of the door, which may be provided with a lock ofthe ordinary or any preferred construction, in the keyhole a of which islocated a key which, as usual, is-

provided at one of its ends with a bow B and at its other end with abit. (Not'shown.) The guard consists of a bar or piece 0, which has atits outer end on its upper surface a tubular portion 0, which forms abearing for the screw-threaded rod or bolt D, which is provided on itsouter end with a milled thumbpiece d and near said thumb-piece with ashoulder 61, which rests against the tubular portion a of the bar orpiece 0, which is provided at its inner end with a projection E to fitwithin the slot of the keyhole. The projection E of the bar 0 is locatedon the upper portion of the inner end of said bar, as is clearly shownin Fig. 2 of the drawings, so that when said projection is fitted in theslot of the keyhole the downwardly-depending portion e of the bar willrest on the surface of the door beneath the slot of the keyhole, whilethe upper portion of the projection will lie directly under the bit ofthe key. The bar 0 is provided on its sides at the depending portion 6with shoulders e, which rest on either side of the slot of the keyholeand prevent the bar wabbling and also the passage of an instrumentthrough the keyhole. Engaging the screw-threaded rod or bolt D is ablock or piece G, which has in its lower portion a slotg to receive thebar 0. The upper end of the block or bar G is placed in the bow B of thekey and may be adjusted to any suitable position on the bar 0 by turningthe rod D in the proper direction.

From the foregoing and by reference to the drawings it will be seen andclearly understood that by placing the projection E of the bar 0 in theslot of the keyhole and inserting the upper portion of the block orpiece G in the bow of the key it will be impossible for the key to beturned or removed from the keyhole.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The combination with a bar having at one of its ends a tubularportion, and at its other end aprojection to fit in the keyhole of adoor, of a screw-threaded rod having its bearings in the tubular portionof the bar and a block or piece engaging the screw-threaded portion ofsaid rod, and the upper portion of the said bar, substantially asdescribed.

2. The combination with a bar having on one of its ends a tubular piece,and on its I portion of said rod and having a slot in its other end aprojection to fit in the keyhole of lower portion to receive the upperpart of the a door, said bar being provided on its sides i bar,substantially as described.

with shoulders located near the said projec- LEOPOLD MULLAUER. 5 tion,of a screw-threaded rod having its bear- Witnesses:

ing in the tubular portion of the bar, and a CHAS. C. TILLMAN,

block or piece engaging the screw-threaded HERMAN CEDERQUIST.

